Yes...one verse theology. It always leads to bad theology. As another example the wedding at Cana.....Roman Catholicism has taken one verse out of John and turned Mary into a demi-goddess.
If you read ahead to Acts, you will see how Peter, and the other disciples, exercised this.
37Now when they heard this, they were pierced to the heart, and said to Peter and the rest of the apostles, “Brethren, what shall we do?” 38Peter said to them, “Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit. Acts 2:37-38 NASB
Now tie this back into the passage from Matthew 16.
13Now when Jesus came into the district of Caesarea Philippi, He was asking His disciples, “Who do people say that the Son of Man is?” 14And they said, “Some say John the Baptist; and others, Elijah; but still others, Jeremiah, or one of the prophets.” 15He said to them, “But who do you say that I am?” 16Simon Peter answered, “You are the Christ, the Son of the living God.” 17And Jesus said to him, “Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven. 18“I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. 19“I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven.” 20Then He warned the disciples that they should tell no one that He was the Christ. Matthew 16:13-20 NASB
Now, this exchange is also recorded in Mark and Luke.
And He continued by questioning them, “But who do you say that I am?” Peter *answered and *said to Him, “You are the Christ.” Mark 8:29 NASB
And He said to them, “But who do you say that I am?” And Peter answered and said, “The Christ of God.” Luke 9:20 NASB
The emphasis of this exchange is Peter's confession.....Jesus is the Christ.
This is the message the church is built upon....Jesus is the Christ.
This is the message Peter and the disciples preached beginning at Pentecost and going forward.
It is the same message Paul preached in his ministries.
It is the same message conveyed by every believer in Christ since the 1st century.
The OT writers understood their salvation was from God and that He was the rock.
It is a clear consistent message from beginning to end.
Why? Because He is the Alpha and the Omega.
The NT is crystal clear....we can only gain Heaven through faith in Christ and Christ alone....no one or no other thing will gain us Heaven.
Any other message that says otherwise is a false gospel and is to be shunned.
((((Sigh)))) I can't say you show exacting judgment and a great regard for truth.